We found an efficient, inexpensive and straightforward
procedure for the one-pot synthesis of dihydropyrimidinones
(thiones) using Fe3O4 NPs as a catalyst. We also found that the
performance of the catalytic system is greatly facilitated when
used without solvents, which is important from the view point
of green chemistry. Moreover, the catalysts are nonhygroscopic
and inexpensive, which are advantages of this transformation.